High temperature deformation behavior of high Si ferritic/martensitic steel
Ferric/Martensitic(F/M)steel has become a candidate structural material for advanced nuclear reactors due to its excellent radiation resistance and high temperature mechanical properties.Increasing the Si content can improve the corrosion resistance of F/M steel,but the introduction of high silicon will deteriorate its hot working performance.Therefore,studying the high temperature deformation behavior of high Si F/M steel is very important.Under the conditions of deformation temperature of 950-1200℃and deformation rate of 0.01-10 s-1,a Gleeble1500 thermal simulation testing machine was used to conduct hot compression simulation tests on 10Cr1Si F/M steel with silicon content of 1%,and its high temperature deformation behavior was studied.The results show that dynamic recrystallization occurs in the 10Cr1Si steel at low deformation rates of 0.01-0.1 s-1.However,dynamic recovery occurs at high deformation rate of 1-10 s-1,and abnormal dynamic recrystallization only occurs under deformation conditions of 10 s-1/950℃within the design parameter range of this experiment.The microstructure analysis shows that when the deformation temperature is low and the deformation rate is fast,the rapidly growing dislocations promote dynamic recrystallization of austenite.The Arrhenius constitutive equation and strain compensation constitutive model of the 10Cr1Si steel are calculated,and the calculated true stress values of the experimental steel are in good agreement with the experimental values,which can provide guidance for the hot working of the 10Cr1Si steel.
high Si ferritic/martensitic steelhot compression simulation testhigh temperature deformation behaviorconstitutive equation
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